See every change.
Know what matters.
Watch websites, APIs, and accessibility. Keep the evidence, understand the change, and alert the right team.
onchange.app/pricing / last 24h
A pricing edit becomes a reviewable diff, then routes to the right team.
- Source
- Pricing page
- Compared
- Text + visual
- Delivered
- Email + Slack
Interactive product demo
See a website change become evidence.
Choose an edit or type your own. OnChange reveals the exact diff, classifies its impact, and decides whether an alert is worth sending.
Live change simulation
acme.com/pricing · running in your browser
Editable page
Type directly in the sample copy
Acme Cloud
Simple pricing
Your edit is detected automatically.
Or trigger a sample change
OnChange evidence
Exact diff and impact classification
- Fetch
- Diff
- Classify
Waiting for an edit
Choose a sample change or type in the page. Evidence will appear here.
Monitoring is active
No alert is sent until a meaningful change is found.
No signup needed. Your sample edit stays in this browser.
Everything needed to prove what changed
Monitor one page or scope a whole site. Keep the evidence ready for review.
Whole-site evidence
Archive every public page with HTML, CSS, screenshots, redirects, and WCAG results.
Scope a siteClean comparisons
Review text, visual, structure, and metadata changes in one place.
See the comparatorWCAG regressions
Separate new, persistent, and resolved findings from an attested baseline.
Review accessibilityStructured monitoring
Watch APIs, sitemaps, robots rules, prices, or one selected element.
Choose what to watchUseful alerts only
Route meaningful changes with semantic rules and confidence scoring.
Find your workflow
Built for teams who watch the web
Choose your workflow. See the signals and evidence that matter to your team.
Paste. Compare. Route.
Start with one URL. OnChange handles the evidence trail.
- 01
Add a URL
Choose a page, API, sitemap, or whole public site.
- 02
Compare evidence
Review text, visual, structure, metadata, and WCAG changes.
- 03
Route the signal
Send useful alerts to email, Slack, Discord, or webhooks.
Start free. Scale when needed.
Clear limits, no credit card, and no hidden alert fees.
For critical coverage and dedicated support.
Contact salesEvery plan includes
- Text and structured API diffs
- Sitemap and robots.txt monitoring
- Automated WCAG scanning
- Email, Slack, Discord, and webhook delivery
Explore monitoring by goal
Go deeper without turning the homepage into a product manual.
Questions, answered
What teams usually ask before monitoring their first page.